Abstract
High-quality ZnO:Co thin films were synthesized on the sapphire (0001) substrates by pulsed laser deposition. XRD result reveals that the Zn1-xCoxO films are of wurtzite-type crystal structure with x up to x = 0.35. The structural, optical and magnetic properties of ZnO:Co thin films are studied by experiments and theoretical calculations. Electronic structure of ZnO:Co with native defects are studied by the first-principles density functional theory. The experimental data and theoretical data have demonstrated quite good agreement. The optical and magneto-optical properties, namely, on-and off-diagonal conductivity tensor and the transversal Kerr effect (TKE), are calculated for comparison with available experimental data. The origin of observed TKE peaks is discussed..
Highlights
It is widely expected that new and novel functionalities for electronics and photonics can be derived from the injection, transfer and detection of carrier spin at room temperature
The observation of ferromagnetism in undoped Zinc oxide (ZnO) has opened up the possibility to use this compound in magneto-optics and magnetoelectronics
ZnO doped with transition metals has been predicted theoretically to be very good candidates for room temperature ferromagnetism, but the investigation results are rather controversial
Summary
It is widely expected that new and novel functionalities for electronics and photonics can be derived from the injection, transfer and detection of carrier spin at room temperature. Zinc oxide (ZnO) due to the wide direct band gap of 3.37 eV at room temperature is an important host material in many optoelectronic and spintronic devices.
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